Chevron Australia has let a master contract to Aker Solutions for a subsea compression system for the company’s Jansz-Io field offshore Western Australia.
The first stage of the contract is the front-end engineering and design of a subsea compression station that will boost gas recovery at the field, which is part of the overall Gorgon region development that supplies gas to the 15.6 million-tonne/year LNG and domestic gas plants on Barrow Island.
The FEED scope also includes an unmanned power and control floater along with overall field system engineering services. Aker said the field control station will distribute onshore power to the subsea compression station.
The company added that the new subsea gas compression system will improve gas recovery more cost-effectively and with a smaller environmental footprint than a conventional semisubmersible compressor station.
The idea is to help maintain plateau gas production rates as the natural reservoir pressure drops over time.
Jansz-Io field lies 200 km off the northwestern Western Australia. The compression project is part of the original development plan for the overall Gorgon project.
Aker Solutions pioneered subsea compression when it delivered the world’s first subsea system for Equinor’s Asgard field in the North Sea offshore Norway in 2015.
Chevron has 47.3% of Gorgon-Jansz-Io while ExxonMobil Corp. has 25%, Royal Dutch Shell PLC 25%, Osaka Gas 1.25%, Tokyo Gas 1%, and JERA 0.417%.
